Question

Reaction of Grignard reagent, $C_2{H}_{5}MgBr$ with $C_8{H}_{8}O$ followed by hydrolysis gives compound “A” which reacts instantly with Lucas reagent to give compound B, $C_{10}{H}_{13}Cl.$ The compound B is:

• A.
• B.
• C.
• D.

Answer 1

The correct option is D

Answer: (d)

$C_8{H}_{8}O\underset{H+}{\overset{C_2{H}_{5}MgBr}{\to }}A\stackrel{\text{Lucas reagent}}{\to }{C}_{10}{H}_{13}Cl\left(B\right)$

Lucas test is used to differentiate and categorize primary, secondary and tertiary alcohols using a solution of anhydrous zinc chloride in concentrated hydrochloric acid. This solution is commonly referred to as the Lucas reagent.

Primary, Secondary, and Tertiary alcohols react with the Lucas reagent to form the chloroalkane at different rates.

The solution turns turbid immediatly in case of tertiary alcohol (Tertiary butyl alcohol ).

Hence, compound (A) is a tertiary alcohol.
Thus, it react with lucas reagent to give tertiary chloride compound.
Hence, option (d) is the only tertiary chloride compound.